Improvement in the manufacture of pasteboard



' 2Sheets--Sheetl.- G. W. RUSSELL,

Manufacture hf Pasteboard. I No. I68,l86, r Patented Sept.28,l875'.

III] I 4w. WRussdl.

MPEG3, FHOITO-LHHDGRAPHER. WASHINGTON. D is.

facture, directly from the NI'IED STATES GEORGE W. RUSSELL, OFLAWRENCEMASSAGHUSETTS.

'IMPROVEMENT IN MANUFACTURE OF PASTEBOARD.

Specification forming part of Letters Patent No. 168,186, datedSeptember 28, February 23, 1875.

To all whom it may concern:

Be it known that I, GEORGE W. RUSSELL, of Lawrence, Essex county,Massachusetts, have invented a Method of Manufacturing Thick Papers, ofwhich the following is a specification:

This invention relates to means for producing thick papers for variouspurposes, which are obtained by the unison or joining together ofseveral layers or sheets; and consists in the method, hereinafterexplained, of pasting or cementing together two or more webs ofpartially-completed paper in the process of manuvats, and previous tobeing dried.

Thedrawings accompanying this specification represent, in Figure 1, aplan, and in Fig. 2 a vertical and longitudinal section, of a cylinderpaper-machine embodying my invention. Fig. 3 is a side elevation of aportionof one of the stuff-vats, showing the .application of mymechanism thereto. Fig. at of the said draw-- ings represents aperspective of one of the stuff-vats, showing the application of thepasting trough and roll.

In these drawings, A and B represent two stuff vats of a cylinder papermachine, so called, the cylinder molds which wallow in the pulpcontained in such vats, and upon which the film or web of pulp isformed, being shown at O G and D D, respectively, while the endlesscarrying-aprons for supporting the web as it leaves the mold are shownrespectively at E F, and the various rollers about which such aprons.travel at a a a, &c. The pressrolls nearest each vat are shown at b band c 0, respectively, and the web of pulp from each vat at d and 6,respectively, the rolls for sup porting the first web (1, after thelatter leaves its endless apron and before joining the second web, beingshown at f f, &c.

The above elementary features are common to cylinder paper-machines nowin general use, and contain in themselves nothing to which I lay claim.

In carrying the principle of my invention into practice, I combine withthe machine an apparatus for applying a coat of paste to the under sideof the upper web, and to efi'ect this result I proceed as follows:Between the housings or standards g g, which surmount the vat 1875application filed B and carry the rolls f f before named, I dispose ahorizontal trough, H, which spans the area between the housings, and iscapable of containing a small quantity of paste. overflow-pipe, i,connects the interior of the trough with a cistern, j, arrangedalongside of the vat B, and serves to carry back to such cistern anyexcess of paste, which would otherwise overflow the trough, while asecond pipe, is, connects the interior of the cistern with a pump, "5,arranged alongside of it, and I a third pipe, m, connects the pump withthe interior of the trough. A paste distributing or applying roll, n, isdisposed within the trough, and wallows in the paste contained in thelatter, and this roll is so situated that the first web of pulp travelsin contact with it. A pulley, 0, is affixed to one end of the roll a orits journal, and. this pulley is belted'to a drivin g-pulley affixed tothe journal of the. lower press-roll 0, which rotates the roll a in thepaste contained within the trough. The pump 1 isdriven by a suitablepower, and serves to force paste from the cistern j to the trough H, tosupply the amount taken up and applied by the roll n, and theoverflow-pipe leading back to the cistern enables me to keep the troughfilled at all times without danger of overflowing it.

The result of this arrangement of the pasting mechanism will be seen ata glance.

The under side of the first Web 11, as it trav- I els over thepasting-roll it, receives a coat of paste from such roll, and as the twowebs meet and pass together through the press-rolls c 0 they arethoroughly united, and subsequently dried upon the drier of the machine.

The two webs d and e, as they reach the vicinity of the pasting-roll,are naturally in a somewhat porous and plastic orsemipulpy condition andin a state highly favorable to receive the paste to the best advantage,as the fibers are in practically a loose and open condition, and thepaste permeates them to such an extent as to efiect an almosthomogeneous mass or web.

I am enabled to produce by my method a thick paper or board, composed ofseveral sheets or layers, which will never split or bein texture.

produced by the union of several sheets or layers in different manners.For instance, in the manufacture of printers press-boards or papers, twoor more webs are completed in the machine, with the exception of drying,wound upon reels, and, while in a moist condition, united or runtogether, without means of securing'them other than the natural adhesiveproperties which they possess or may have acquired while in a pulpycondition. I am also aware that thick papers have been manufactured byrunning together two webs in a semi-pulpy'condit-ion prior to theirentrance to the press-rolls; but in this instance, as in the first, nomeans outside of the pulp, as it leaves the vat, are brought into use tosecure the webs together.

I have found, during an extensive experience as a paper-manufacturer,that these modes of producing thick papers cannot be depended upon, asthere isgreat tendency of the webs or sheets to separate; and I havefound this objection especially applicable to the manufacture ofhristol-board, so called, and paper for merchandise tags and labels, thetwo latter especially,.owing to the hard usage they undergo.

invention to exist.

I claim- 1. The described improvement in the manufacture of thick paperfrom two or more webs of pulp, which consists in the application ofpaste to said webs at the time and in the manner set forth that is tosay, while said webs are yet in a plastic, semi-pulpy, and incompletecondition, and in transit to the pressrolls, by which the several pastedwebs are united and joined in a single homogeneous sheet, as described.

2. The combination, with a paper-machine, of a trough for receiving alimited quantity of paste, a roll wallowing in such paste, andtransmitting the latter to one or more webs of pulp, and finally of acistern for containing a considerable quantity of paste, and a pumpconnected with such cistern, for delivering such paste to the trough, anoverflow-pipe extending from the trough to the cistern, and the wholebeing substantially as and for the purposes stated.

GEORGE W. RUSSELL.

Witnesses: v

J. M. WHEATON, A. N. BURBANK.

